Marc Wieland
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53 lines
1.6 KiB
TypeScript
53 lines
1.6 KiB
TypeScript
/*
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* Copyright 2020 Adobe. All rights reserved.
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* This file is licensed to you under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License. You may obtain a copy
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* of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under
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* the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
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* OF ANY KIND, either express or implied. See the License for the specific language
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* governing permissions and limitations under the License.
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*/
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import {MutableRefObject, Ref} from 'react';
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/**
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* Merges multiple refs into one. Works with either callback or object refs.
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*/
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export function mergeRefs<T>(...refs: Array<Ref<T> | MutableRefObject<T> | null | undefined>): Ref<T> {
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if (refs.length === 1 && refs[0]) {
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return refs[0];
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}
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return (value: T | null) => {
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let hasCleanup = false;
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const cleanups = refs.map(ref => {
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const cleanup = setRef(ref, value);
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hasCleanup ||= typeof cleanup == 'function';
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return cleanup;
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});
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if (hasCleanup) {
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return () => {
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cleanups.forEach((cleanup, i) => {
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if (typeof cleanup === 'function') {
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cleanup();
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} else {
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setRef(refs[i], null);
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}
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});
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};
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}
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};
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}
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function setRef<T>(ref: Ref<T> | MutableRefObject<T> | null | undefined, value: T) {
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if (typeof ref === 'function') {
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return ref(value);
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} else if (ref != null) {
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ref.current = value;
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}
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}
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